Showerhead



FIG. 1 is a perspective view of a showerhead showing a new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof; and,

FIG. 4 is a top view thereof (the bottom view, right side view and left side view being mirror images).

The broken lines in the Figures are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a showerhead, as shown and described. 